Dubbo入门到实战（一）

- 日理万妓 2023-10-03 09:33 8阅读 0赞

**目录**

简述

1.Dubbo性能高的原因

2.Dubbo框架

3.Dubbo支持的协议

4.Dubbo直连案例

4.1服务提供者provider项目：

4.2服务消费者Consumer:

4.3测试直连项目

5.dubbo直连方式-官方推荐方式

（1）创建服务提供者web工程

（2）创建服务消费者web工程

（3）创建java接口工程

（4）接口工程DubboInteface01中添加业务接口和实体类

（5）提供者DubboProvider01项目需要在pom.xml中引入DubboInteface01工程

（6）提供者DubboProvider01项目实现DubboInteface01中的接口方法

（7）提供者DubboProvider01项目，配置dubbo信息

（8）消费者DubboConsumer01项目需要在pom.xml中引入DubboInteface01工程

（9）消费者DubboConsumer01项目创建视图控制层

（10）消费者DubboConsumer01项目添加dubbo配置

(11)消费者DubboConsumer01项目添加视图jsp页面

（12）为提供者DubboProvider01项目、消费者DubboConsumer01配置tomcat

（13）启动这两个tomcat访问系统

--------------------

#### **简述** ####

Dubbo是一款高性能、轻量级的开源Java RPC框架，它提供了三大核心能力：面向接口的远程方法调用，智能容错和负载均衡，以及服务自动注册和发现。

#### **1.Dubbo性能高的原因** ####

高性能要从底层的原理说起，既然是一个RPC框架，主要干的就是远程过程（方法）调用，那么提升性能就要从最关键、最耗时的两个方面入手：序列化和网络通信。

序列化：我们学习java网络开发的时候知道，本地对象要在网络上传输，必须要实现Serializable接口，也就是必须序列化。我们序列化的方案很多：xml、json、二进制流，其中效率最高的就是二进制流（因为计算机就是二进制的）。然而Dubbo采用的就是效率最高的二进制。

网络通信：不同于HTTP需要进行7步走（三次握手和四次挥手），Dubbo采用Socket通信机制，一步到位，提升了通信效率，并且可以建立长连接，不用反复连接，直接传输数据。

#### **2.Dubbo框架** ####

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70][]

服务容器（Container）：服务容器负责启动、加载、运行服务提供者。

服务提供者（Provider）：暴露服务的服务提供方，服务提供者在启动时，向注册中心注册自己提供的服务。

服务消费者（Consumer）：调用远程服务的服务消费方，服务消费者在启动时，向注册中心订阅自己所需的服务，服务消费者从提供者地址列表中，基于软负载均衡算法，选一台提供者进行调用，如果调用失败，再选一台服务调用。

注册中心（Registry）：注册中心返回服务提供者地址列表给消费者，如果有变更，注册中心将依据长连接推送变更数据给消费者。

监控中心（Monitor）：服务消费者和提供者，在内存中累计调用次数和调用时间，定时每分钟发送一次统计数据到监控中心

#### **3.Dubbo支持的协议** ####

支持多种协议：dubbo、http、webservice、memcached、redis等，dubbo官方推荐使用dubbo协议，dubbo协议默认端口20880。

使用dubbo协议，spring配置文件中加入

<dubbo:protocol name="dubbo" port="20880"/>

#### **4.Dubbo直连案例** ####

只有提供者和消费者，不添加注册中心的方式。

#### **4.1服务提供者provider项目：** ####

（1）创建provider提供者maven项目

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 1][]

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（2）pom.xml添加需要的jar包

<dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>dubbo</artifactId>
          <version>2.6.1</version>
        </dependency>
    
        
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context</artifactId>
          <version>4.3.16.RELEASE</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>4.3.16.RELEASE</version>
        </dependency>

（3）开发对外暴露的接口

/**
     * 对外暴露的一些接口
     */
    public interface SomeService {
    
        String sayHello(String msg);
    
    }

（4）接口的实现类

/**
     * 接口实现类
     */
    public class SomeServiceImpl implements SomeService {
        
        public String sayHello(String msg) {
            return "Hello:"+msg;
        }
    }

（5）resources目录下添加dubbo的相关spring配置文件dubbo-provider.xml

需要声明提供者名称、协议方式、端口、提供的服务、接口实现类

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
           xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
    
        
        <dubbo:application name="dubbo-provider"/>
    
        
        <dubbo:protocol name="dubbo" port="20880"/>
    
    
        
        <dubbo:service interface="com.qingyun.service.SomeService"
                       ref="someServiceImpl" registry="N/A"/>
    
        
        <bean id="someServiceImpl" class="com.qingyun.service.impl.SomeServiceImpl"/>
    
    
    
    
    </beans>

（6）在webapp/WEB-INF目录下的web.xml中配置文本加载监听，把配置的dubbo配置文件加载进去

#### **4.2服务消费者Consumer:** ####

(1)创建maven项目

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 4][]

（2）pom.xml添加需要的jar包

（3）注入provider提供者jar包

maven项目默认打出的是jar包，但是提供者项目DubboProvider中的pom.xml文件中的包方式为war包，需要注释包方式

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 5][]

打开项目的maven管理，在Lifecycle中先clean再install，打出jar包，并且放到本地maven私服中去

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 6][]

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在消费者中添加我们打出来的DubboProvider项目jar包，pom.xml添加配置：

<dependency>
                <groupId>com.qingyun</groupId>
                <artifactId>DubboProvider</artifactId>
                <version>1.0-SNAPSHOT</version>
            </dependency>

（4）创建后台调用的controller控制层，注入SomeService接口并调用其方法

@Controller
    public class SomeController {
    
        @Autowired
        private SomeService someService;
    
        @RequestMapping(value = "/hello")
        public String hello(Model model){
            String hello = someService.sayHello("World");
            model.addAttribute("hello",hello);
            return "hello";
        }
    }

（5）在resources目录下，创建dubbo的配置dubbo-consumer.xml文件

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
           xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
    
        
        <dubbo:application name="dubbo-consumer"/>
    
        
        <dubbo:reference id="someService" interface="com.qingyun.service.SomeService"
                         url="dubbo://localhost:20880" registry="N/A"/>
    
    
    </beans>

（6）在resources目录下，创建springmvc.xml配置中央调试器，配置视图方面的访问信息

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:context="http://www.springframework.org/schema/context"
           xmlns:mvc="http://www.springframework.org/schema/mvc"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
             http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-4.3.xsd
            http://www.springframework.org/schema/mvc
            http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">
    
        
        <context:component-scan base-package="com.qingyun.controller" />
    
        
        <mvc:default-servlet-handler />
    
        
        <mvc:annotation-driven />
    
        
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
                id="internalResourceViewResolver">
            
            <property name="prefix" value="/" />
            
            <property name="suffix" value=".jsp" />
        </bean>
    </beans>

（7）配置中央调试器，在web.xml中配置上加载的资源，拦截的资源

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
              http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
             version="4.0">
    
        <servlet>
            
            <servlet-name>springmvc</servlet-name>
            
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath*:springmvc.xml,classpath*:dubbo-consumer.xml</param-value>
            </init-param>
            
            <load-on-startup>1</load-on-startup>
        </servlet>
    
        
        <servlet-mapping>
             <servlet-name>springmvc</servlet-name>
             <url-pattern>/</url-pattern>
        </servlet-mapping>
    
    </web-app>

（8）创建jsp页面，测试数据

<%--
      Created by IntelliJ IDEA.
      User: zhanglizeng
      Date: 2021/7/3
      Time: 16:09
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
    <h1>${hello}</h1>
    </body>
    </html>

（9）idea添加tomcat服务器，需要添加两个tomcat，一个启动提供者项目，一个启动消费者项目

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 8][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 9][]

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①创建tomcat为启动提供者项目

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 11][]

添加提供者war包依赖

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 12][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 13][]②创建tomcat为消费者提供服务，注意端口冲突问题

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 14][]

添加上需要引入的war包

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 15][]

#### **4.3测试直连项目** ####

（1）启动提供者项目的tomcat，打印dubbo的映射地址，版本、主机地址等信息

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 16][]

(2)启动消费者consumer项目，通过[http://localhost:8082/hello][http_localhost_8082_hello]访问页面，说明已经调用到注入的提供者provider项目中的方法，是使用的接口调用的方式

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 17][]

#### **5.dubbo直连方式-官方推荐方式** ####

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 18][]

dubbo官方推荐使用的项目结构如下：

1）服务提供者工程：实现接口工程中的业务接口，web工程

2）服务消费者工程：消费服务提供者提供的业务接口，web工程

3）接口工程：业务接口和实体类，java工程

#### **（1）创建服务提供者web工程** ####

创建过程与4.1一致

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 19][]

#### **（2）创建服务消费者web工程** ####

创建过程与4.2一致

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 20][]

#### **（3）创建java接口工程** ####

不勾选create from archetype创建maven java工程

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 21][]

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#### **（4）接口工程DubboInteface01中添加业务接口和实体类** ####

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 23][]

SomeService接口

/**
     * 接口提供
     */
    public interface SomeService {
    
    
        String sayHello(String msg);
        
        User getUserById(Integer id);
    }

User实体

public class User {
        private Integer id;
        private String name;
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public Integer getId() {
            return id;
        }
    
        public void setId(Integer id) {
            this.id = id;
        }
    }

#### **（5）提供者DubboProvider01项目需要在pom.xml中引入DubboInteface01工程** ####

pom.xml配置

<?xml version="1.0" encoding="UTF-8"?>
    
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
    
      <groupId>com.qingyun</groupId>
      <artifactId>DubbboProvicer01</artifactId>
      <version>1.0-SNAPSHOT</version>
      <packaging>war</packaging>
    
      <dependencies>
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.11</version>
          <scope>test</scope>
        </dependency>
    
        
        <dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>dubbo</artifactId>
          <version>2.6.1</version>
        </dependency>
    
        
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context</artifactId>
          <version>4.3.16.RELEASE</version>
        </dependency>
    
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>4.3.16.RELEASE</version>
        </dependency>
    
        
        <dependency>
          <groupId>com.qingyun</groupId>
          <artifactId>DubboInterface01</artifactId>
          <version>1.0-SNAPSHOT</version>
        </dependency>
    
      </dependencies>
    </project>

#### **（6）提供者DubboProvider01项目实现DubboInteface01中的接口方法** ####

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 24][]

SomeServiceImpl接口实现类

/**
     * 接口实现类
     */
    public class SomeServiceImpl implements SomeService {
    
        public String sayHello(String msg) {
            return "hello"+msg;
        }
    
        public User getUserById(Integer id) {
            User user = new User();
            user.setId(id);
            user.setName("张三"+id);
            return user;
        }
    }

#### （7）**提供者DubboProvider01项目，配置dubbo信息** ####

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 25][]

dubbo-provider.xml

web.xml

#### **（8）消费者DubboConsumer01项目需要在pom.xml中引入DubboInteface01工程** ####

pom.xml配置

<?xml version="1.0" encoding="UTF-8"?>
    
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
    
      <groupId>com.qingyun</groupId>
      <artifactId>DubboConsumer01</artifactId>
      <version>1.0-SNAPSHOT</version>
      <packaging>war</packaging>
    
      <dependencies>
            <dependency>
              <groupId>junit</groupId>
              <artifactId>junit</artifactId>
              <version>4.11</version>
              <scope>test</scope>
            </dependency>
            
            <dependency>
              <groupId>com.alibaba</groupId>
              <artifactId>dubbo</artifactId>
              <version>2.6.1</version>
            </dependency>
    
            
            <dependency>
              <groupId>org.springframework</groupId>
              <artifactId>spring-context</artifactId>
              <version>4.3.16.RELEASE</version>
            </dependency>
    
            <dependency>
              <groupId>org.springframework</groupId>
              <artifactId>spring-webmvc</artifactId>
              <version>4.3.16.RELEASE</version>
            </dependency>
          
            
          <dependency>
              <groupId>com.qingyun</groupId>
              <artifactId>DubboInterface01</artifactId>
              <version>1.0-SNAPSHOT</version>
          </dependency>
    
        </dependencies>
    </project>

#### （9）**消费者DubboConsumer01项目创建视图控制层** ####

使用官方推荐的方式，此时注入的选项里面没有实现类impl类的选项了

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 26][]

SomeController类

/**
     * 控制层
     */
    @Controller
    public class SomeController {
    
        @Autowired
        private SomeService someService;
    
        @RequestMapping(value="hello")
        public String hello(Model model){
            String world = someService.sayHello("world");
            model.addAttribute("hello",world);
            return "hello";
        }
    
        @RequestMapping(value="userDetail")
        public String userDetail(Model model,Integer id){
            User user = someService.getUserById(id);
            model.addAttribute("user",user);
            return "userDetail";
        }
    
    }

#### （10）**消费者DubboConsumer01项目添加dubbo配置** ####

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 27][]

dubbo-consumer.xml

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
           xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
     
        
        <dubbo:application name="dubbo-consumer"/>
     
        
        <dubbo:reference id="someService" interface="com.qingyun.service.SomeService"
                         url="dubbo://localhost:20880" registry="N/A"/>
     
     
    </beans>

springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:context="http://www.springframework.org/schema/context"
           xmlns:mvc="http://www.springframework.org/schema/mvc"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
             http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-4.3.xsd
            http://www.springframework.org/schema/mvc
            http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">
    
        
        <context:component-scan base-package="com.qingyun.controller" />
    
        
        <mvc:default-servlet-handler />
    
        
        <mvc:annotation-driven />
    
        
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
                id="internalResourceViewResolver">
            
            <property name="prefix" value="/" />
            
            <property name="suffix" value=".jsp" />
        </bean>
    </beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
              http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
             version="4.0">
    
        <servlet>
            
            <servlet-name>springmvc</servlet-name>
            
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath*:springmvc.xml,classpath*:dubbo-consumer.xml</param-value>
            </init-param>
            
            <load-on-startup>1</load-on-startup>
        </servlet>
    
        
        <servlet-mapping>
            <servlet-name>springmvc</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
    
    </web-app>

#### **(11)消费者DubboConsumer01项目添加视图jsp页面** ####

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 28][]

#### **（12）为提供者DubboProvider01项目、消费者DubboConsumer01配置tomcat** ####

**配置步骤见4.2（9）**

![20210706222540447.png][]

#### **（13）启动这两个tomcat访问系统** ####

**hello页面：**

![20210706223021936.png][]

userDetail页面：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 29][]

由于查询结果使用User实体返回，user实体需要序列化，否则会报错

java.lang.IllegalStateException: Serialized class 
    com.qingyun.model.User must implement java.io.Serializable

DubboInteface01项目中的User实体实现序列化

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 30][]

此时访问正常

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 31][]

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[http_localhost_8082_hello]: http://localhost:8082/hello
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70 17]: https://img-blog.csdnimg.cn/20210703234436370.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H,size_16,color_FFFFFF,t_70
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[20210706222540447.png]: https://img-blog.csdnimg.cn/20210706222540447.png
[20210706223021936.png]: https://img-blog.csdnimg.cn/20210706223021936.png
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